GSI LUMONICS 2860070-519涿州市

我们的PLC-DCS备件已经建立了独特的全球采购关系，强大的电子商务的推广，
大幅度的折扣，交货快捷，和数以万计的产品销售信息。我们真正的价值优势是
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GSI LUMONICS 2860070-519涿州市
GSI LUMONICS 2860070-519涿州市
传统的继电器—接触器控制的电动机的起动、自保持及停止电路，按下起动按钮SB2，
接触器KM线圈得电并自锁，电动机起动运行，按下停止按钮SB1，接触器KM线圈失电，
电动机停止运行。和继电器控制系统类似，PLC也是由输入部分，逻辑部分和输
出部分组成。其相对应的元件安排如下按下起动按钮SB2，X000接收外部信号置“1”，
Y000置“1”并自锁，自锁的目的是当起动按钮SB2松开，X000置“0”时，Y000仍然能
保持置“1”状态，使电动机连续运行。需要停车时，按下停止按钮SB1，X001常闭触电
置“0”，断开Y000，使Y000置“0”，使电动机停止运行。其相应的控制梯形图如图1


所示：
程序清单：
LD  X000
OR  Y000
ANI  X001
OUT  Y000
END
电动机起动、自保持及停止控制电路是梯形图中最典型的单元，它包含了梯形图程序的


全部
要素，具体体现如下几点：
1．事件：每一个梯形图支路都针对一个事件。事件用输出线圈表示，本例中为Y000。
2．事件发生的条件：梯形图支路中除了线圈外还有触点的组合，使线圈置“1”的条件


即
是事件发生的条件，本例中为起动按钮SB2使X000“1”。
3．事件得以延续得条件：触点组合中使线圈置“1”得以保持得条件是与X000并联得


Y000自锁触点闭合。
4．使事件终止的条件：触点组合中使线圈置“1”中断的条件。本例中为停止按钮SB1


使X001常闭触点断开。
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